add new test_multiple_instances according to issue #8

test/test_config_provider.py

@@ -47,4 +47,14 @@ class TestConfigProvider(unittest.TestCase):
         old_dict, self.config.dict, 'old_dict musst not equal self.config.dict')
 
   def test_get_instance(self):
+    self.assertEqual(config_provider.ConfigProvider.getInstance(), self.config)
+
+  def test_multiple_instances(self):
+    def get_constant_dict():
+      return {'foo': 'bar'}
+    config_provider.ConfigProvider(
+      load_function = {'function': get_constant_dict}, name = 'constant')
+    self.assertNotEqual(
+      config_provider.ConfigProvider.getInstance(),
+      config_provider.ConfigProvider.getInstance(name = 'constant'))
     self.assertEqual(config_provider.ConfigProvider.getInstance(), self.config)
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